Masonry Stoves, Masonry Heaters and Masonry Fireplaces (also known as the Russian Fireplace), plus Masonry Ovens and Earth Ovens: How to design and build your own very efficient, low-cost masonry heaters, ovens, and earth ovens.
Between two rooms or on an inside wall is the best placement for a single story home. At the stair base for a two story - for the stairs to wrap around it. Can have a wood burning baking oven on the other side of it. or warming 'oven' alcove built in to it the way it is. Would be great between tub and bed, or kitchen and den - sunny window, heated bench, warm blanket, book ... NAP TIME!